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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes

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Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv

Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
This commit is contained in:
Coleen Phillimore 2008-04-13 17:43:42 -04:00
parent 680ecf1611
commit 4a831d45f0
273 changed files with 6585 additions and 2993 deletions
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14
hotspot/src/share/vm/memory/universe.cpp
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@ -99,6 +99,7 @@ size_t Universe::_heap_capacity_at_last_gc;
size_t Universe::_heap_used_at_last_gc;
CollectedHeap* Universe::_collectedHeap = NULL;
address Universe::_heap_base = NULL;
void Universe::basic_type_classes_do(void f(klassOop)) {
@ -464,7 +465,7 @@ void Universe::init_self_patching_vtbl_list(void** list, int count) {
class FixupMirrorClosure: public ObjectClosure {
public:
void do_object(oop obj) {
virtual void do_object(oop obj) {
if (obj->is_klass()) {
EXCEPTION_MARK;
KlassHandle k(THREAD, klassOop(obj));
@ -667,7 +668,7 @@ jint universe_init() {
"LogHeapWordSize is incorrect.");
guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
"oop size is not not a multiple of HeapWord size");
"oop size is not not a multiple of HeapWord size");
TraceTime timer("Genesis", TraceStartupTime);
GC_locker::lock(); // do not allow gc during bootstrapping
JavaClasses::compute_hard_coded_offsets();
@ -759,6 +760,15 @@ jint Universe::initialize_heap() {
if (status != JNI_OK) {
return status;
}
if (UseCompressedOops) {
// Subtract a page because something can get allocated at heap base.
// This also makes implicit null checking work, because the
// memory+1 page below heap_base needs to cause a signal.
// See needs_explicit_null_check.
// Only set the heap base for compressed oops because it indicates
// compressed oops for pstack code.
Universe::_heap_base = Universe::heap()->base() - os::vm_page_size();
}
// We will never reach the CATCH below since Exceptions::_throw will cause
// the VM to exit if an exception is thrown during initialization